22165646 has 4 divisors (see below), whose sum is σ = 33248472. Its totient is φ = 11082822.

The previous prime is 22165643. The next prime is 22165669. The reversal of 22165646 is 64656122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64656122 = 2 ⋅32328061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22165643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5541410 + ... + 5541413.

It is an arithmetic number, because the mean of its divisors is an integer number (8312118).

Almost surely, 2^22165646 is an apocalyptic number.

22165646 is a deficient number, since it is larger than the sum of its proper divisors (11082826).

22165646 is a wasteful number, since it uses less digits than its factorization.

22165646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11082825.

The product of its digits is 17280, while the sum is 32.

The square root of 22165646 is about 4708.0405690690. The cubic root of 22165646 is about 280.9054278321.

The spelling of 22165646 in words is "twenty-two million, one hundred sixty-five thousand, six hundred forty-six".